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Normal rings support 16b CQEs for posting completions, while certain features require the ring to be configured with IORING_SETUP_CQE32, as they need to convey more information per completion. This, in turn, makes ALL the CQEs be 32b in size. This is somewhat wasteful and inefficient, particularly when only certain CQEs need to be of the bigger variant. This adds support for setting up a ring with mixed CQE sizes, using IORING_SETUP_CQE_MIXED. When setup in this mode, CQEs posted to the ring may be either 16b or 32b in size. If a CQE is 32b in size, then IORING_CQE_F_32 is set in the CQE flags to indicate that this is the case. If this flag isn't set, the CQE is the normal 16b variant. CQEs on these types of mixed rings may also have IORING_CQE_F_SKIP set. This can happen if the ring is one (small) CQE entry away from wrapping, and an attempt is made to post a 32b CQE. As CQEs must be contigious in the CQ ring, a 32b CQE cannot wrap the ring. For this case, a single dummy CQE is posted with the SKIP flag set. The application should simply ignore those. Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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